Hello
Do any of you know/recommend any geothermal well drillers in the Cincinnati, Ohio area?

Thanks
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Howard,
Have you tried the International Ground Source Heat Pump Association web site (igshpa)?
There are several Cinci. installers though I don't see any drillers. It has every one listed by address though and I wouldn't know the name of adjacent communities.
If you don't see a nearby driller ask one of the local installers or ask a driller that's further away (many of us travel a little farther than we used to).